The MAX1185 is a 3V, dual 10-bit analog-to-digital converter
(ADC) featuring fully-differential wideband trackand-
hold (T/H) inputs, driving two pipelined, nine-stage
ADCs. The MAX1185 is optimized for low-power, high
dynamic performance applications in imaging, instrumentation,
and digital communication applications. This
ADC operates from a single 2.7V to 3.6V supply, consuming
only 105mW while delivering a typical signal-tonoise
ratio (SNR) of 59.5dB at an input frequency of
7.5MHz and a sampling rate of 20Msps. Digital outputs
A and B are updated alternating on the rising (CHA)
and falling (CHB) edge of the clock. The T/H driven
input stages incorporate 400MHz (-3dB) input amplifiers.
The converters may also be operated with singleended
inputs. In addition to low operating power, the
MAX1185 features a 2.8mA sleep mode as well as a
1μA power-down mode to conserve power during idle
periods.
An internal 2.048V precision bandgap reference sets
the full-scale range of the ADC. A flexible reference
structure allows the use of this internal or an externally
derived reference, if desired for applications requiring
increased accuracy or a different input voltage range.
The MAX1185 features parallel, multiplexed, CMOScompatible
three-state outputs. The digital output format
can be set to two’s complement or straight offset
binary through a single control pin. The device provides
for a separate output power supply of 1.7V to 3.6V for
flexible interfacing. The MAX1185 is available in a 7mm
x 7mm, 48-pin TQFP package, and is specified for the
extended industrial (-40°C to +85°C) temperature
range.
Pin-compatible, nonmultiplexed. high-speed versions of
the MAX1185 are also available. Please refer to the
MAX1180 data sheet for 105Msps, the MAX1181 data
sheet for 80Msps, the MAX1182 data sheet for 65Msps,
the MAX1183 data sheet for 40Msps, and the MAX1184
data sheet for 20Msps.